Mixed translation redirects

[StanFromIreland]

When you go to: docs.python.org/pl/ you are automatically redirected to https://docs.python.org/pl/3/.

When you go to: docs.python.org/el/ the folders containing all builds are listed, and you are not automatically redirected.

And, finally, some seem to have to page at all: https://docs.python.org/ro/3/ 404s.

[StanFromIreland]

Furthermore, PEP 545 is not implemented fully:

https://docs.python.org/en/ will redirect to https://docs.python.org/.

[AA-Turner]

The latter part should be removed from the PEP in the forthcoming round of updates, at this point it would be disruptive to change it for very little value. I'll fix the former, thank you for the reminder.

A